locore.s revision 25164
1/*- 2 * Copyright (c) 1990 The Regents of the University of California. 3 * All rights reserved. 4 * 5 * This code is derived from software contributed to Berkeley by 6 * William Jolitz. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. All advertising materials mentioning features or use of this software 17 * must display the following acknowledgement: 18 * This product includes software developed by the University of 19 * California, Berkeley and its contributors. 20 * 4. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 * 36 * from: @(#)locore.s 7.3 (Berkeley) 5/13/91 37 * $Id: locore.s,v 1.85 1997/04/22 06:55:24 jdp Exp $ 38 * 39 * originally from: locore.s, by William F. Jolitz 40 * 41 * Substantially rewritten by David Greenman, Rod Grimes, 42 * Bruce Evans, Wolfgang Solfrank, Poul-Henning Kamp 43 * and many others. 44 */ 45 46#include "apm.h" 47#include "opt_cpu.h" 48#include "opt_ddb.h" 49#include "opt_userconfig.h" 50#include "opt_smp.h" 51#include "opt_smp_privpages.h" 52#include "opt_serial.h" 53 54#include <sys/errno.h> 55#include <sys/syscall.h> 56#include <sys/reboot.h> 57 58#include <machine/asmacros.h> 59#include <machine/cputypes.h> 60#include <machine/psl.h> 61#include <machine/pmap.h> 62#include <machine/specialreg.h> 63 64#if defined(SMP) && defined(SMP_PRIVPAGES) 65#include <machine/apic.h> 66#endif /* SMP && PRIVPAGES */ 67 68#include "assym.s" 69 70/* 71 * XXX 72 * 73 * Note: This version greatly munged to avoid various assembler errors 74 * that may be fixed in newer versions of gas. Perhaps newer versions 75 * will have more pleasant appearance. 76 */ 77 78/* 79 * PTmap is recursive pagemap at top of virtual address space. 80 * Within PTmap, the page directory can be found (third indirection). 81 */ 82 .globl _PTmap,_PTD,_PTDpde 83 .set _PTmap,(PTDPTDI << PDRSHIFT) 84 .set _PTD,_PTmap + (PTDPTDI * PAGE_SIZE) 85 .set _PTDpde,_PTD + (PTDPTDI * PDESIZE) 86 87/* 88 * APTmap, APTD is the alternate recursive pagemap. 89 * It's used when modifying another process's page tables. 90 */ 91 .globl _APTmap,_APTD,_APTDpde 92 .set _APTmap,APTDPTDI << PDRSHIFT 93 .set _APTD,_APTmap + (APTDPTDI * PAGE_SIZE) 94 .set _APTDpde,_PTD + (APTDPTDI * PDESIZE) 95 96/* 97 * Globals 98 */ 99 .data 100 ALIGN_DATA /* just to be sure */ 101 102 .globl HIDENAME(tmpstk) 103 .space 0x2000 /* space for tmpstk - temporary stack */ 104HIDENAME(tmpstk): 105 106 .globl _boothowto,_bootdev 107 108 .globl _cpu,_cpu_vendor,_cpu_id,_bootinfo 109 .globl _cpu_high, _cpu_feature 110 111_cpu: .long 0 /* are we 386, 386sx, or 486 */ 112_cpu_id: .long 0 /* stepping ID */ 113_cpu_high: .long 0 /* highest arg to CPUID */ 114_cpu_feature: .long 0 /* features */ 115_cpu_vendor: .space 20 /* CPU origin code */ 116_bootinfo: .space BOOTINFO_SIZE /* bootinfo that we can handle */ 117 118_KERNend: .long 0 /* phys addr end of kernel (just after bss) */ 119physfree: .long 0 /* phys addr of next free page */ 120 121#if defined(SMP) && defined(SMP_PRIVPAGES) 122cpu0pp: .long 0 /* phys addr cpu0 private pg */ 123cpu0pt: .long 0 /* phys addr cpu0 private pt */ 124 125 .globl _cpu0prvpage,_cpu0prvpt 126_cpu0prvpage: .long 0 /* relocated version */ 127_cpu0prvpt: .long 0 /* relocated version */ 128#endif /* SMP && PRIVPAGES */ 129 130 .globl _IdlePTD 131_IdlePTD: .long 0 /* phys addr of kernel PTD */ 132 133_KPTphys: .long 0 /* phys addr of kernel page tables */ 134 135 .globl _proc0paddr 136_proc0paddr: .long 0 /* address of proc 0 address space */ 137p0upa: .long 0 /* phys addr of proc0's UPAGES */ 138 139#ifdef BDE_DEBUGGER 140 .globl _bdb_exists /* flag to indicate BDE debugger is present */ 141_bdb_exists: .long 0 142#endif 143 144 145/********************************************************************** 146 * 147 * Some handy macros 148 * 149 */ 150 151#define R(foo) ((foo)-KERNBASE) 152 153#define ALLOCPAGES(foo) \ 154 movl R(physfree), %esi ; \ 155 movl $((foo)*PAGE_SIZE), %eax ; \ 156 addl %esi, %eax ; \ 157 movl %eax, R(physfree) ; \ 158 movl %esi, %edi ; \ 159 movl $((foo)*PAGE_SIZE),%ecx ; \ 160 xorl %eax,%eax ; \ 161 cld ; \ 162 rep ; \ 163 stosb 164 165/* 166 * fillkpt 167 * eax = page frame address 168 * ebx = index into page table 169 * ecx = how many pages to map 170 * base = base address of page dir/table 171 * prot = protection bits 172 */ 173#define fillkpt(base, prot) \ 174 shll $2,%ebx ; \ 175 addl base,%ebx ; \ 176 orl $PG_V,%eax ; \ 177 orl prot,%eax ; \ 1781: movl %eax,(%ebx) ; \ 179 addl $PAGE_SIZE,%eax ; /* increment physical address */ \ 180 addl $4,%ebx ; /* next pte */ \ 181 loop 1b 182 183/* 184 * fillkptphys(prot) 185 * eax = physical address 186 * ecx = how many pages to map 187 * prot = protection bits 188 */ 189#define fillkptphys(prot) \ 190 movl %eax, %ebx ; \ 191 shrl $PAGE_SHIFT, %ebx ; \ 192 fillkpt(R(_KPTphys), prot) 193 194 .text 195/********************************************************************** 196 * 197 * This is where the bootblocks start us, set the ball rolling... 198 * 199 */ 200NON_GPROF_ENTRY(btext) 201 202#ifdef PC98 203 jmp 1f 204 .globl _pc98_system_parameter 205 .org 0x400 206_pc98_system_parameter: 207 .space 0x240 /* BIOS parameter block */ 2081: 209 /* save SYSTEM PARAMETER for resume (NS/T or other) */ 210 movl $0xa1000,%esi 211 movl $0x100000,%edi 212 movl $0x0630,%ecx 213 cld 214 rep 215 movsb 216#else /* IBM-PC */ 217#ifdef BDE_DEBUGGER 218#ifdef BIOS_STEALS_3K 219 cmpl $0x0375c339,0x95504 220#else 221 cmpl $0x0375c339,0x96104 /* XXX - debugger signature */ 222#endif 223 jne 1f 224 movb $1,R(_bdb_exists) 2251: 226#endif 227 228/* Tell the bios to warmboot next time */ 229 movw $0x1234,0x472 230#endif /* PC98 */ 231 232/* Set up a real frame in case the double return in newboot is executed. */ 233 pushl %ebp 234 movl %esp, %ebp 235 236/* Don't trust what the BIOS gives for eflags. */ 237 pushl $PSL_KERNEL 238 popfl 239 240/* 241 * Don't trust what the BIOS gives for %fs and %gs. Trust the bootstrap 242 * to set %cs, %ds, %es and %ss. 243 */ 244 mov %ds, %ax 245 mov %ax, %fs 246 mov %ax, %gs 247 248 call recover_bootinfo 249 250/* Get onto a stack that we can trust. */ 251/* 252 * XXX this step is delayed in case recover_bootinfo needs to return via 253 * the old stack, but it need not be, since recover_bootinfo actually 254 * returns via the old frame. 255 */ 256 movl $R(HIDENAME(tmpstk)),%esp 257 258#ifdef PC98 259 testb $0x02,0x100620 /* pc98_machine_type & M_EPSON_PC98 */ 260 jz 3f 261 cmpb $0x0b,0x100624 /* epson_machine_id <= 0x0b */ 262 ja 3f 263 264 /* count up memory */ 265 movl $0x100000,%eax /* next, talley remaining memory */ 266 movl $0xFFF-0x100,%ecx 2671: movl 0(%eax),%ebx /* save location to check */ 268 movl $0xa55a5aa5,0(%eax) /* write test pattern */ 269 cmpl $0xa55a5aa5,0(%eax) /* does not check yet for rollover */ 270 jne 2f 271 movl %ebx,0(%eax) /* restore memory */ 272 addl $PAGE_SIZE,%eax 273 loop 1b 2742: subl $0x100000,%eax 275 shrl $17,%eax 276 movb %al,0x100401 2773: 278#endif 279 280 call identify_cpu 281 282/* clear bss */ 283/* 284 * XXX this should be done a little earlier. 285 * 286 * XXX we don't check that there is memory for our bss and page tables 287 * before using it. 288 * 289 * XXX the boot program somewhat bogusly clears the bss. We still have 290 * to do it in case we were unzipped by kzipboot. Then the boot program 291 * only clears kzipboot's bss. 292 * 293 * XXX the gdt and idt are still somewhere in the boot program. We 294 * depend on the convention that the boot program is below 1MB and we 295 * are above 1MB to keep the gdt and idt away from the bss and page 296 * tables. The idt is only used if BDE_DEBUGGER is enabled. 297 */ 298 movl $R(_end),%ecx 299 movl $R(_edata),%edi 300 subl %edi,%ecx 301 xorl %eax,%eax 302 cld 303 rep 304 stosb 305 306#if NAPM > 0 307/* 308 * XXX it's not clear that APM can live in the current environonment. 309 * Only pc-relative addressing works. 310 */ 311 call _apm_setup 312#endif 313 314 call create_pagetables 315 316#ifdef BDE_DEBUGGER 317/* 318 * Adjust as much as possible for paging before enabling paging so that the 319 * adjustments can be traced. 320 */ 321 call bdb_prepare_paging 322#endif 323 324/* Now enable paging */ 325 movl R(_IdlePTD), %eax 326 movl %eax,%cr3 /* load ptd addr into mmu */ 327 movl %cr0,%eax /* get control word */ 328 orl $CR0_PE|CR0_PG,%eax /* enable paging */ 329 movl %eax,%cr0 /* and let's page NOW! */ 330 331#ifdef BDE_DEBUGGER 332/* 333 * Complete the adjustments for paging so that we can keep tracing through 334 * initi386() after the low (physical) addresses for the gdt and idt become 335 * invalid. 336 */ 337 call bdb_commit_paging 338#endif 339 340 pushl $begin /* jump to high virtualized address */ 341 ret 342 343/* now running relocated at KERNBASE where the system is linked to run */ 344begin: 345 /* set up bootstrap stack */ 346 movl _proc0paddr,%esp /* location of in-kernel pages */ 347 addl $UPAGES*PAGE_SIZE,%esp /* bootstrap stack end location */ 348 xorl %eax,%eax /* mark end of frames */ 349 movl %eax,%ebp 350 movl _proc0paddr,%eax 351 movl _IdlePTD, %esi 352 movl %esi,PCB_CR3(%eax) 353 354 movl physfree, %esi 355 pushl %esi /* value of first for init386(first) */ 356 call _init386 /* wire 386 chip for unix operation */ 357 popl %esi 358 359 .globl __ucodesel,__udatasel 360 361 pushl $0 /* unused */ 362 pushl __udatasel /* ss */ 363 pushl $0 /* esp - filled in by execve() */ 364 pushl $PSL_USER /* eflags (IOPL 0, int enab) */ 365 pushl __ucodesel /* cs */ 366 pushl $0 /* eip - filled in by execve() */ 367 subl $(12*4),%esp /* space for rest of registers */ 368 369 pushl %esp /* call main with frame pointer */ 370 call _main /* autoconfiguration, mountroot etc */ 371 372 hlt /* never returns to here */ 373 374/* 375 * When starting init, call this to configure the process for user 376 * mode. This will be inherited by other processes. 377 */ 378NON_GPROF_ENTRY(prepare_usermode) 379 /* 380 * Now we've run main() and determined what cpu-type we are, we can 381 * enable write protection and alignment checking on i486 cpus and 382 * above. 383 */ 384#if defined(I486_CPU) || defined(I586_CPU) || defined(I686_CPU) 385 cmpl $CPUCLASS_386,_cpu_class 386 je 1f 387 movl %cr0,%eax /* get control word */ 388 orl $CR0_WP|CR0_AM,%eax /* enable i486 features */ 389 movl %eax,%cr0 /* and do it */ 3901: 391#endif 392 /* 393 * on return from main(), we are process 1 394 * set up address space and stack so that we can 'return' to user mode 395 */ 396 movl __ucodesel,%eax 397 movl __udatasel,%ecx 398 399#if 0 400 movl %cx,%ds 401#endif 402 movl %cx,%es 403 movl %ax,%fs /* double map cs to fs */ 404 movl %cx,%gs /* and ds to gs */ 405 ret /* goto user! */ 406 407 408#define LCALL(x,y) .byte 0x9a ; .long y ; .word x 409 410/* 411 * Signal trampoline, copied to top of user stack 412 */ 413NON_GPROF_ENTRY(sigcode) 414 call SIGF_HANDLER(%esp) 415 lea SIGF_SC(%esp),%eax /* scp (the call may have clobbered the */ 416 /* copy at 8(%esp)) */ 417 pushl %eax 418 pushl %eax /* junk to fake return address */ 419 movl $SYS_sigreturn,%eax /* sigreturn() */ 420 LCALL(0x7,0) /* enter kernel with args on stack */ 421 hlt /* never gets here */ 422 ALIGN_TEXT 423_esigcode: 424 425 .data 426 .globl _szsigcode 427_szsigcode: 428 .long _esigcode-_sigcode 429 .text 430 431/********************************************************************** 432 * 433 * Recover the bootinfo passed to us from the boot program 434 * 435 */ 436recover_bootinfo: 437 /* 438 * This code is called in different ways depending on what loaded 439 * and started the kernel. This is used to detect how we get the 440 * arguments from the other code and what we do with them. 441 * 442 * Old disk boot blocks: 443 * (*btext)(howto, bootdev, cyloffset, esym); 444 * [return address == 0, and can NOT be returned to] 445 * [cyloffset was not supported by the FreeBSD boot code 446 * and always passed in as 0] 447 * [esym is also known as total in the boot code, and 448 * was never properly supported by the FreeBSD boot code] 449 * 450 * Old diskless netboot code: 451 * (*btext)(0,0,0,0,&nfsdiskless,0,0,0); 452 * [return address != 0, and can NOT be returned to] 453 * If we are being booted by this code it will NOT work, 454 * so we are just going to halt if we find this case. 455 * 456 * New uniform boot code: 457 * (*btext)(howto, bootdev, 0, 0, 0, &bootinfo) 458 * [return address != 0, and can be returned to] 459 * 460 * There may seem to be a lot of wasted arguments in here, but 461 * that is so the newer boot code can still load very old kernels 462 * and old boot code can load new kernels. 463 */ 464 465 /* 466 * The old style disk boot blocks fake a frame on the stack and 467 * did an lret to get here. The frame on the stack has a return 468 * address of 0. 469 */ 470 cmpl $0,4(%ebp) 471 je olddiskboot 472 473 /* 474 * We have some form of return address, so this is either the 475 * old diskless netboot code, or the new uniform code. That can 476 * be detected by looking at the 5th argument, if it is 0 477 * we are being booted by the new uniform boot code. 478 */ 479 cmpl $0,24(%ebp) 480 je newboot 481 482 /* 483 * Seems we have been loaded by the old diskless boot code, we 484 * don't stand a chance of running as the diskless structure 485 * changed considerably between the two, so just halt. 486 */ 487 hlt 488 489 /* 490 * We have been loaded by the new uniform boot code. 491 * Let's check the bootinfo version, and if we do not understand 492 * it we return to the loader with a status of 1 to indicate this error 493 */ 494newboot: 495 movl 28(%ebp),%ebx /* &bootinfo.version */ 496 movl BI_VERSION(%ebx),%eax 497 cmpl $1,%eax /* We only understand version 1 */ 498 je 1f 499 movl $1,%eax /* Return status */ 500 leave 501 /* 502 * XXX this returns to our caller's caller (as is required) since 503 * we didn't set up a frame and our caller did. 504 */ 505 ret 506 5071: 508 /* 509 * If we have a kernelname copy it in 510 */ 511 movl BI_KERNELNAME(%ebx),%esi 512 cmpl $0,%esi 513 je 2f /* No kernelname */ 514 movl $MAXPATHLEN,%ecx /* Brute force!!! */ 515 movl $R(_kernelname),%edi 516 cmpb $'/',(%esi) /* Make sure it starts with a slash */ 517 je 1f 518 movb $'/',(%edi) 519 incl %edi 520 decl %ecx 5211: 522 cld 523 rep 524 movsb 525 5262: 527 /* 528 * Determine the size of the boot loader's copy of the bootinfo 529 * struct. This is impossible to do properly because old versions 530 * of the struct don't contain a size field and there are 2 old 531 * versions with the same version number. 532 */ 533 movl $BI_ENDCOMMON,%ecx /* prepare for sizeless version */ 534 testl $RB_BOOTINFO,8(%ebp) /* bi_size (and bootinfo) valid? */ 535 je got_bi_size /* no, sizeless version */ 536 movl BI_SIZE(%ebx),%ecx 537got_bi_size: 538 539 /* 540 * Copy the common part of the bootinfo struct 541 */ 542 movl %ebx,%esi 543 movl $R(_bootinfo),%edi 544 cmpl $BOOTINFO_SIZE,%ecx 545 jbe got_common_bi_size 546 movl $BOOTINFO_SIZE,%ecx 547got_common_bi_size: 548 cld 549 rep 550 movsb 551 552#ifdef NFS 553 /* 554 * If we have a nfs_diskless structure copy it in 555 */ 556 movl BI_NFS_DISKLESS(%ebx),%esi 557 cmpl $0,%esi 558 je olddiskboot 559 movl $R(_nfs_diskless),%edi 560 movl $NFSDISKLESS_SIZE,%ecx 561 cld 562 rep 563 movsb 564 movl $R(_nfs_diskless_valid),%edi 565 movl $1,(%edi) 566#endif 567 568 /* 569 * The old style disk boot. 570 * (*btext)(howto, bootdev, cyloffset, esym); 571 * Note that the newer boot code just falls into here to pick 572 * up howto and bootdev, cyloffset and esym are no longer used 573 */ 574olddiskboot: 575 movl 8(%ebp),%eax 576 movl %eax,R(_boothowto) 577 movl 12(%ebp),%eax 578 movl %eax,R(_bootdev) 579 580#if defined(USERCONFIG_BOOT) && defined(USERCONFIG) 581#ifdef PC98 582 movl $0x90200, %esi 583#else 584 movl $0x10200, %esi 585#endif 586 movl $R(_userconfig_from_boot),%edi 587 movl $512,%ecx 588 cld 589 rep 590 movsb 591#endif /* USERCONFIG_BOOT */ 592 593 ret 594 595 596/********************************************************************** 597 * 598 * Identify the CPU and initialize anything special about it 599 * 600 */ 601identify_cpu: 602 603 /* Try to toggle alignment check flag; does not exist on 386. */ 604 pushfl 605 popl %eax 606 movl %eax,%ecx 607 orl $PSL_AC,%eax 608 pushl %eax 609 popfl 610 pushfl 611 popl %eax 612 xorl %ecx,%eax 613 andl $PSL_AC,%eax 614 pushl %ecx 615 popfl 616 617 testl %eax,%eax 618 jnz try486 619 620 /* NexGen CPU does not have aligment check flag. */ 621 pushfl 622 movl $0x5555, %eax 623 xorl %edx, %edx 624 movl $2, %ecx 625 clc 626 divl %ecx 627 jz trynexgen 628 popfl 629 movl $CPU_386,R(_cpu) 630 jmp 3f 631 632trynexgen: 633 movl $CPU_NX586,R(_cpu) 634 movl $0x4778654e,R(_cpu_vendor) # store vendor string 635 movl $0x72446e65,R(_cpu_vendor+4) 636 movl $0x6e657669,R(_cpu_vendor+8) 637 movl $0,R(_cpu_vendor+12) 638 jmp 3f 639 640try486: /* Try to toggle identification flag; does not exist on early 486s. */ 641 pushfl 642 popl %eax 643 movl %eax,%ecx 644 xorl $PSL_ID,%eax 645 pushl %eax 646 popfl 647 pushfl 648 popl %eax 649 xorl %ecx,%eax 650 andl $PSL_ID,%eax 651 pushl %ecx 652 popfl 653 654 testl %eax,%eax 655 jnz trycpuid 656 movl $CPU_486,R(_cpu) 657 658 /* 659 * Check Cyrix CPU 660 * Cyrix CPUs do not change the undefined flags following 661 * execution of the divide instruction which divides 5 by 2. 662 * 663 * Note: CPUID is enabled on M2, so it passes another way. 664 */ 665 pushfl 666 movl $0x5555, %eax 667 xorl %edx, %edx 668 movl $2, %ecx 669 clc 670 divl %ecx 671 jnc trycyrix 672 popfl 673 jmp 3f /* You may use Intel CPU. */ 674 675trycyrix: 676 popfl 677 /* 678 * IBM Bluelighting CPU also doesn't change the undefined flags. 679 * Because IBM doesn't disclose the information for Bluelighting 680 * CPU, we couldn't distinguish it from Cyrix's (including IBM 681 * brand of Cyrix CPUs). 682 */ 683 movl $0x69727943,R(_cpu_vendor) # store vendor string 684 movl $0x736e4978,R(_cpu_vendor+4) 685 movl $0x64616574,R(_cpu_vendor+8) 686 jmp 3f 687 688trycpuid: /* Use the `cpuid' instruction. */ 689 xorl %eax,%eax 690 .byte 0x0f,0xa2 # cpuid 0 691 movl %eax,R(_cpu_high) # highest capability 692 movl %ebx,R(_cpu_vendor) # store vendor string 693 movl %edx,R(_cpu_vendor+4) 694 movl %ecx,R(_cpu_vendor+8) 695 movb $0,R(_cpu_vendor+12) 696 697 movl $1,%eax 698 .byte 0x0f,0xa2 # cpuid 1 699 movl %eax,R(_cpu_id) # store cpu_id 700 movl %edx,R(_cpu_feature) # store cpu_feature 701 rorl $8,%eax # extract family type 702 andl $15,%eax 703 cmpl $5,%eax 704 jae 1f 705 706 /* less than Pentium; must be 486 */ 707 movl $CPU_486,R(_cpu) 708 jmp 3f 7091: 710 /* a Pentium? */ 711 cmpl $5,%eax 712 jne 2f 713 movl $CPU_586,R(_cpu) 714 jmp 3f 7152: 716 /* Greater than Pentium...call it a Pentium Pro */ 717 movl $CPU_686,R(_cpu) 7183: 719 ret 720 721 722/********************************************************************** 723 * 724 * Create the first page directory and its page tables. 725 * 726 */ 727 728create_pagetables: 729 730 testl $CPUID_PGE, R(_cpu_feature) 731 jz 1f 732 movl %cr4, %eax 733 orl $CR4_PGE, %eax 734 movl %eax, %cr4 7351: 736 737/* Find end of kernel image (rounded up to a page boundary). */ 738 movl $R(_end),%esi 739 740/* include symbols in "kernel image" if they are loaded and useful */ 741#ifdef DDB 742 movl R(_bootinfo+BI_ESYMTAB),%edi 743 testl %edi,%edi 744 je over_symalloc 745 movl %edi,%esi 746 movl $KERNBASE,%edi 747 addl %edi,R(_bootinfo+BI_SYMTAB) 748 addl %edi,R(_bootinfo+BI_ESYMTAB) 749over_symalloc: 750#endif 751 752 addl $PAGE_MASK,%esi 753 andl $~PAGE_MASK,%esi 754 movl %esi,R(_KERNend) /* save end of kernel */ 755 movl %esi,R(physfree) /* next free page is at end of kernel */ 756 757/* Allocate Kernel Page Tables */ 758 ALLOCPAGES(NKPT) 759 movl %esi,R(_KPTphys) 760 761/* Allocate Page Table Directory */ 762 ALLOCPAGES(1) 763 movl %esi,R(_IdlePTD) 764 765/* Allocate UPAGES */ 766 ALLOCPAGES(UPAGES) 767 movl %esi,R(p0upa) 768 addl $KERNBASE, %esi 769 movl %esi, R(_proc0paddr) 770 771#if defined(SMP) && defined(SMP_PRIVPAGES) 772/* Allocate cpu0's private data page */ 773 ALLOCPAGES(1) 774 movl %esi,R(cpu0pp) 775 addl $KERNBASE, %esi 776 movl %esi, R(_cpu0prvpage) /* relocated to KVM space */ 777 778/* Allocate cpu0's private page table for mapping priv page, apic, etc */ 779 ALLOCPAGES(1) 780 movl %esi,R(cpu0pt) 781 addl $KERNBASE, %esi 782 movl %esi, R(_cpu0prvpt) /* relocated to KVM space */ 783#endif /* SMP && SMP_PRIVPAGES */ 784 785/* Map read-only from zero to the end of the kernel text section */ 786 xorl %eax, %eax 787#ifdef BDE_DEBUGGER 788/* If the debugger is present, actually map everything read-write. */ 789 cmpl $0,R(_bdb_exists) 790 jne map_read_write 791#endif 792 xorl %edx,%edx 793 testl $CPUID_PGE, R(_cpu_feature) 794 jz 2f 795 orl $PG_G,%edx 796 7972: movl $R(_etext),%ecx 798 addl $PAGE_MASK,%ecx 799 shrl $PAGE_SHIFT,%ecx 800 fillkptphys(%edx) 801 802/* Map read-write, data, bss and symbols */ 803 movl $R(_etext),%eax 804 addl $PAGE_MASK, %eax 805 andl $~PAGE_MASK, %eax 806map_read_write: 807 movl $PG_RW,%edx 808 testl $CPUID_PGE, R(_cpu_feature) 809 jz 1f 810 orl $PG_G,%edx 811 8121: movl R(_KERNend),%ecx 813 subl %eax,%ecx 814 shrl $PAGE_SHIFT,%ecx 815 fillkptphys(%edx) 816 817/* Map page directory. */ 818 movl R(_IdlePTD), %eax 819 movl $1, %ecx 820 fillkptphys($PG_RW) 821 822/* Map proc0's UPAGES in the physical way ... */ 823 movl R(p0upa), %eax 824 movl $UPAGES, %ecx 825 fillkptphys($PG_RW) 826 827/* Map ISA hole */ 828 movl $ISA_HOLE_START, %eax 829 movl $ISA_HOLE_LENGTH>>PAGE_SHIFT, %ecx 830 fillkptphys($PG_RW) 831 832#if defined(SMP) && defined(SMP_PRIVPAGES) 833/* Map cpu0's private page into global KVM */ 834 movl R(cpu0pp), %eax 835 movl $1, %ecx 836 fillkptphys($PG_RW) 837 838/* Map cpu0's private page table into global KVM */ 839 movl R(cpu0pt), %eax 840 movl $1, %ecx 841 fillkptphys($PG_RW) 842 843/* Map the private page into the private page table (4K @ 0xff80000) */ 844 movl R(cpu0pp), %eax 845 movl $0, %ebx /* pte offset = 0 */ 846 movl $1, %ecx /* one private page coming right up */ 847 fillkpt(R(cpu0pt), $PG_RW) 848 849/* Map the default Local APIC address (4K @ 0xff801000) */ 850 movl $DEFAULT_APIC_BASE, %eax /* XXX just testing.. */ 851 movl $1, %ebx /* pte offset = 1 */ 852 movl $1, %ecx /* Bing! Local APIC appears */ 853 fillkpt(R(cpu0pt), $PG_RW|PG_N) 854 855/* Map the default IO APIC address (4K @ 0xff802000) */ 856 movl $DEFAULT_IO_APIC_BASE, %eax /* XXX just testing.. */ 857 movl $2, %ebx /* pte offset = 2 */ 858 movl $1, %ecx /* Bing! Local APIC appears */ 859 fillkpt(R(cpu0pt), $PG_RW|PG_N) 860 861/* ... and put the page table in the pde. */ 862 movl R(cpu0pt), %eax 863 movl $MPPTDI, %ebx 864 movl $1, %ecx 865 fillkpt(R(_IdlePTD), $PG_RW) 866#endif /* SMP && SMP_PRIVPAGES */ 867 868/* install a pde for temporary double map of bottom of VA */ 869 movl R(_KPTphys), %eax 870 xorl %ebx, %ebx 871 movl $1, %ecx 872 fillkpt(R(_IdlePTD), $PG_RW) 873 874/* install pde's for pt's */ 875 movl R(_KPTphys), %eax 876 movl $KPTDI, %ebx 877 movl $NKPT, %ecx 878 fillkpt(R(_IdlePTD), $PG_RW) 879 880/* install a pde recursively mapping page directory as a page table */ 881 movl R(_IdlePTD), %eax 882 movl $PTDPTDI, %ebx 883 movl $1,%ecx 884 fillkpt(R(_IdlePTD), $PG_RW) 885 886 ret 887 888#ifdef BDE_DEBUGGER 889bdb_prepare_paging: 890 cmpl $0,R(_bdb_exists) 891 je bdb_prepare_paging_exit 892 893 subl $6,%esp 894 895 /* 896 * Copy and convert debugger entries from the bootstrap gdt and idt 897 * to the kernel gdt and idt. Everything is still in low memory. 898 * Tracing continues to work after paging is enabled because the 899 * low memory addresses remain valid until everything is relocated. 900 * However, tracing through the setidt() that initializes the trace 901 * trap will crash. 902 */ 903 sgdt (%esp) 904 movl 2(%esp),%esi /* base address of bootstrap gdt */ 905 movl $R(_gdt),%edi 906 movl %edi,2(%esp) /* prepare to load kernel gdt */ 907 movl $8*18/4,%ecx 908 cld 909 rep /* copy gdt */ 910 movsl 911 movl $R(_gdt),-8+2(%edi) /* adjust gdt self-ptr */ 912 movb $0x92,-8+5(%edi) 913 lgdt (%esp) 914 915 sidt (%esp) 916 movl 2(%esp),%esi /* base address of current idt */ 917 movl 8+4(%esi),%eax /* convert dbg descriptor to ... */ 918 movw 8(%esi),%ax 919 movl %eax,R(bdb_dbg_ljmp+1) /* ... immediate offset ... */ 920 movl 8+2(%esi),%eax 921 movw %ax,R(bdb_dbg_ljmp+5) /* ... and selector for ljmp */ 922 movl 24+4(%esi),%eax /* same for bpt descriptor */ 923 movw 24(%esi),%ax 924 movl %eax,R(bdb_bpt_ljmp+1) 925 movl 24+2(%esi),%eax 926 movw %ax,R(bdb_bpt_ljmp+5) 927 movl $R(_idt),%edi 928 movl %edi,2(%esp) /* prepare to load kernel idt */ 929 movl $8*4/4,%ecx 930 cld 931 rep /* copy idt */ 932 movsl 933 lidt (%esp) 934 935 addl $6,%esp 936 937bdb_prepare_paging_exit: 938 ret 939 940/* Relocate debugger gdt entries and gdt and idt pointers. */ 941bdb_commit_paging: 942 cmpl $0,_bdb_exists 943 je bdb_commit_paging_exit 944 945 movl $_gdt+8*9,%eax /* adjust slots 9-17 */ 946 movl $9,%ecx 947reloc_gdt: 948 movb $KERNBASE>>24,7(%eax) /* top byte of base addresses, was 0, */ 949 addl $8,%eax /* now KERNBASE>>24 */ 950 loop reloc_gdt 951 952 subl $6,%esp 953 sgdt (%esp) 954 addl $KERNBASE,2(%esp) 955 lgdt (%esp) 956 sidt (%esp) 957 addl $KERNBASE,2(%esp) 958 lidt (%esp) 959 addl $6,%esp 960 961 int $3 962 963bdb_commit_paging_exit: 964 ret 965 966#endif /* BDE_DEBUGGER */ 967